import sys
import pygame


def check_keydown_events(event, ship):
    if event.key == pygame.k_RIGHT:
        ship.moving_right = True
    elif event.key == pygame.K_LEFT:
        ship.moving_left = True


def check_keyup_events(event, ship):
    if event.key == pygame.K_RIGHT:
        ship.moving_right = False
    elif event.key == pygame.K_LEFT:
        ship.moving_left = False
def check_events(ship):# 响应案件和鼠标事件
    for  event in pygame.event.get():
        if event.type ==pygame.QUIT:
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            check_keydown_events(event,ship)
        elif event.type == pygame.KEYUP:
            check_keydown_events(event, ship)

def update_screen(ai_settings,screen,ship):
    '''更新屏幕上的图像，并切换到新屏幕'''
    #每次循环时都会聪慧屏幕
    screen.fill(ai_settings.bg_color)
    ship.blitme()
    #让最近绘制的屏幕可见
    pygame.display.flip()

